Bis([μ-bis-(diphenyl-phosphino)methane-1:2κP:P']nona-carbonyl-1κC,2κC,3κC-{tris-[4-(methyl-sulfan-yl)phen-yl]arsine-3κAs}-triangulo-triruthenium(0)) dichloro-methane monosolvate.

The asymmetric unit of the title triangulo-triruthenium compound, 2[Ru(3)(C(21)H(21)AsS(3))(C(25)H(22)P(2))(CO)(9)]·CH(2)Cl(2), consists of one triangulo-triruthenium complex mol-ecule and one half of a dichloro-methane mol-ecule which lies across a crystallographic inversion center, leading to the disorder of this mol-ecule over two positions of equal occupancy. The bis-(diphenyl-phosphino)methane ligand bridges an Ru-Ru bond and the monodentate arsine ligand bonds to the third Ru atom. Both the arsine and phosphine ligands are equatorial with respect to the Ru(3) triangle. Each Ru atom carries one equatorial and two axial terminal carbonyl ligands. The three arsine-substituted benzene rings make dihedral angles of 82.69 (9), 70.43 (9) and 89.45 (9)° with each other. The dihedral angles between the two benzene rings are 85.14 (11) and 77.61 (10)° for the two diphenyl-phosphino groups. In the crystal packing, mol-ecules are linked together into dimers via inter-molecular C-H⋯O hydrogen bonds and these dimers are stacked along the a axis. Weak inter-molecular C-H⋯π inter-actions are also present.